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  <script>
    // 冒牌排序:将一组数组按照(从小到大或者从大到小的顺序排列):例:[2,4,1,22,15,56,90,23,4,1]

var arr =[2,4,1,22,15,56,90,23,4,1]

for(var i=0;i<=arr.length-1;i++){ //外层循环管趟数
  for(var j=0;j<=arr.length-i-1;j++){  //里层循环管每一趟交换次数
    //内部交换两个变量的值，前一个和后一个数组元素相比较
    if(arr[j]>arr[j+1]){
      var more=arr[j]
      arr[j]=arr[j+1]
      arr[j+1]=more
    }
  }
}
console.log(arr);
  </script>
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